Cowabunga, dude!

One of my childhood fantasies was to ride my skateboard in a half pipe. And when I was a kid in small town Indiana, skateparks and half pipes were few and far between. But I finally got my chance today. It turns out one of my co-workers has a half pipe in her backyard! I don't know any fancy tricks, and my board is probably 15 years old. But after about three turns I started wondering how much it would cost to build one in my own backyard. My dad does have a complete set of tools.